I think I'd probably agree with Kaj Sotala's remarks if I had read the passages she^H^H^H^H xe had, and judging by your response in the linked comment, I think I would still come to the same conclusion as she^H^H^H^H xe. I don't think your argument actually cuts with the grain of reality, and I am sure it's not sufficient to eliminate concern about UFAI.

Edit: I hasten to add that I would agree with assumption A in a sufficiently slow-takeoff scenario (such as, say, the evolution of human beings, or even wolves). I don't find that sufficiently reassuring when it comes to actually making AI, though.

Edit 2: Correcting gender of pronouns.